Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecfd72487146817c…

MALICIOUS

PDF

79.6 KB Created: 2021-05-10 20:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9fcdc3df791bf733eff5d536c5c68998 SHA-1: 58924725e0916d47ca669b3a9db1fe42b78d69c5 SHA-256: ecfd72487146817c045f52ee3200f5c1e943702564df3c90f48d88cd8041c435
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vilenefex.ru/strik?utm_term=axiom+61+1st+gen PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488822/normal_603cad495b6b2.pdfIn PDF document text
    • https://diwuxofemuji.weebly.com/uploads/1/3/1/4/131407179/5288077.pdfIn PDF document text
    • https://bawidonawasaz.weebly.com/uploads/1/3/4/3/134354070/9884091.pdfIn PDF document text
    • https://jerexibim.weebly.com/uploads/1/3/4/6/134654770/8039623.pdfIn PDF document text
    • https://xidelefexowivap.weebly.com/uploads/1/3/4/3/134366840/gudarerebisozinog.pdfIn PDF document text
    • http://cherrypimp.online/the_theory_of_justice_view_of_ethics_is_based_on_which_of_the_following9t7k8.pdfIn PDF document text
    • http://vipmanmarket.space/mr_peabody_and_sherman_full_movie_online_123moviesp9rc5.pdfIn PDF document text
    • http://testrun.ru/petsafe_underground_fence_transmitter_beepinggv0l6.pdfIn PDF document text
    • https://ripukalogud.weebly.com/uploads/1/3/4/3/134391837/fosiruxifi-ranejimojosijiv-devixaxugotoju.pdfIn PDF document text
    • https://jagusidenoz.weebly.com/uploads/1/3/4/9/134902343/wubeviwipu-gepirigi-pawozer-vunuves.pdfIn PDF document text
    • https://nipobajomofak.weebly.com/uploads/1/3/4/6/134641158/a8758baf11f2660.pdfIn PDF document text
    • http://trycabinets.xyz/mcculloch_mac_3200_chainsaw_specs6vxfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375517/normal_604cd2d2675e7.pdfIn PDF document text
    • https://buvonage.weebly.com/uploads/1/3/0/9/130969236/1653536.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zurovajij/bevodukezorobabasazu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1128edbf-eae9-4be0-b53c-3473d4ca2990/pen_america_best_debut_short_stories_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/687bb18b-770f-4cdf-a22c-a27320ef1065/how_do_i_connect_my_canon_ts3322_to_wifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/892ee91a-0f5e-4e9b-92f4-8cc7220dd742/46260632906.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/jarijevodizafobigugogiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49257b2b-e576-42e9-b157-f35934a54273/dlink_dir605l_setting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92ccdc6c-d481-4cff-88d3-19f85308d1e2/ocr_a_level_biology_past_papers_2013.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF716 4932 bytes
SHA-256: d7c8d884228abbd24422ed15b541276bbe1cf4a988a4796160448e0e451180bd
font_01_sfnt_off000107e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E4 11660 bytes
SHA-256: bbc12dd1933ffcb2cc2e7dc5ce5e4923ca2f73d41cab25e68968aef5e84c4821